Sheave



E. DDRAP'ER. Sheav'e.

No. 228,802. 'Patented 1an. 27,1880.

N. tETERS. PHO'LITHOGRAPHER, wAsHlNGTON, D. uA

y UNITED STATES PATENT OFFICE.

ELLIS D. DEAPEE, E NoEwooD, MASSACHUSETTS.

sHEAvE.

`SPECIFICATION' forming part of Letters Patent No. 223,802, datedJanuary 27, 1880.

Application led December 2'2, 1879.

To all whom it may concern:

Be it known that I, ELLIS D. DRAPER, of Norwood, in the county ofNorfolk, State of Massachusetts, have invented a certain new and usefulImprovement in Sheaves, of which the following is a descriptionsufficiently full, clear, and exact to enable any person skilled in theart or science to which my invention appertains to make and use thesame, reference being had to the accompanying drawings, forming a partof this specification, in which- Figure l is an isometrical perspectiveview; Fig. 2, a vertical longitudinal section; Fig. 3, a view of one ofthe rings; Fig. 4, a view of one of the rollers; Fig. 5, a view of theweb or diaphragm, and Figs. 6, 7 and 8 views showing alternate forms ofconstructing the web.

Like letters indicate corresponding parts in the different gures of thedrawings.

My invention relates to that class of sheaves which are provided withanti-friction rollers;

and it consists in a novel construction and ararranged in a circle, asshown in Fig. l.

der m, as seen in Fig. 3, and have their outer4 edges beveled orchamfered, as shown at d d. The rollers are duplex or double, as bestseen in Fig. 4, the two sections z z being connected by the smalljournal or neck w, which is slightly longer than the thickness of theweb D.

In constructing my improved sheave the rollers K are 'inserted in thenotches a of the web D, each notch or serration being provided with aroller, thus forming a series of rollers The rings B are then slipped onover the ends of the rollers, the rabbets or counterbored ends of thesame being brought into contact, and

uniting to form the annular groove C, which should be of sufficientdepth and width to per- Init the web to move freely therein. The

rollers, web, and rin gs thus arranged are then formed into a core, aprint being used in the ordinary manner, and placed in a proper mold,after which the body A is cast around the rings, as seen in Fig. 2,firmly securing all the parts in proper position.

The chamfered or beveled edges d d permit the metal in casting to flowslightly over the outer ends of the rings B, and thus keep them moresecurely fastened, although this feature is not absolutely essential.

The web shown in Fig. 7 consists of a flat ring made in two parts, toenable it to be inserted in the annular groove or spaces between thesections z z of the rollers K, when the rollers are arranged in acircle, as shown in Fig. l, and before the rings B are slipped over thesame.

I sometimes c'onstruct the rings B BWithout the rabbetm, in which casethey are made slightly shorter, and webs, such as are shown in Figs. 6,7 or 8, are used, the webs being enlarged in diameter to bring themflush with the rings, the body of the sheave being then cast around therings, substantially as before described, in which case the annulargroove C is dispensed with and the web does not revolve.

When the rings B are left plain, or are not provided with the rabbet m,and a web is employed which is equal in diameter to the rings, I preferthe form of web shown in Fig.l 8, consisting of the two sections j j',having the notches t' t', into which the metal flows in casting the bodyA, the ends of the sections being dovetailed together, as seen at g e,to prevent the sections from shunting or becoming displaced in moldingor casting the body.

It will be obvious that where the body A is cast onto the rings, asdescribed, the sheave will be much stronger, and all the parts will beretained in position with greater firmness and precision than ispossible by ordinary methods of construction. It will also be obviousthat when two rings are usedhaving the rabbets m the web and rollers maybe secured in the body of the sheave by pins or screws, or by othermeans than casting the same onto the' rings, as described, if preferred.

I am aware that the rollers K :and also the webs shown in Figs. 5 and 6are in common use, and therefore do not claim the same, broadly; but,

Having thus explained my invention, what I claim is l. In a sheave, therings B, provided with IOO the rabbet m, in combination with the web Dand rollers K, substantially as and for the purpose specified.

2. In a sheave, a web consisting of abisected ring, substantially suchas shown in Fig. 7, in combination with the rollers K and rings B, asand for the purpose set forth.

3. In a sheave, a bisected web provided with the dovetailed ends g e,substantially as and for the purpose described.

4.. In a sheave, a bisected Web provided with the notches i z', as andfor the purpose set forth.

5. In a sheave having the bodyA cast onto or around the rings forretaining the web, the bevel d, substantially as described and shown.

6. The improved sheave described, the saine consisting` of the rollersK, web D, rings B, and body A, the body being east onto or around theweb-retaining rings, substantially as and for the purpose specified.

ELLIS D. DRAPER.

Witnesses C. A. SHAW, J. B. BRAMAN.

